Link for driving-chains



(No Model.)

B. HOLT. LINK FOR DRIVING CHAINS.

No. 570,637. Patented Nov. 3, 1896.

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UNITED STATES PATENT OFFIcn.

BENJAMIN HOLT, OF STOCKTON, CALIFORNIA.

LINK FOR DRIVING-CHAINS SPECIFICATION formingpart of Letters Patent N 0.570,637, dated November 3, 1896. Application filed February 20, 1896.Serial No. 579,992. (No model.)

To all whom it may concern:

Be it known that I, BENJAMIN HOLT, a citizen of the United States,residing at Stockton, county of San Joaquin, State of California, haveinvented an Improvement inLinks for Driving-Chains; and I hereby declarethe following to be a full, clear, and exact description of the same.

My invention relates to certain improvements in the links of whichdriving-chains are composed.

It consists of a segmental removable bushing fitted within thecorresponding recess in the bolt or pin hole of the link and in the lineof draft, so that the wear is confined to this part, which may bereplaced when worn out without sacrificing the link itself.

In the accompanying drawings, Figure 1 is a perspective view of a singlelink, showing the application of the wear-plate or shoe. Fig. 2 is aplan View of a section of the chain to show its character.

My invention is especially adapted to that class of chains in which thelinks are cast in malleable metal, with sides separated to greaterdistance at one end than the other and having reverse curves, so thatthe narrower end of one link fits between the wider end of the oppositeone. The narrower ends of these links have a permanent bar cast integralwith and extending between them, and this bar is cored out, having ahole through it to receive a pin, the ends of which are fixed or securedin holes made in the wider end of the adjacent link.

A A are the side bars of a link of this description, and B is the sleeveor barrel which unites the narrower end of the link and which isadaptedto fit into the teeth of the sprocketwheel over which such chainspass and through which the power is transmitted. This sleeve or barrelis made hollow from end to end, as shown, to receive the pin C. The endsof this pin pass through the reinforced or extended holes D, madethrough the opposite or more widely separated ends of the links, and theends of the pin are firmly headed or secured in these openings so as tohave no motion. This leaves the central portion of the pin fittingwithin the opening in the barrel B, which'turns upon this part of thepin as the chain alternately bends and places where a great deal of gritand dust will accumulate and penetrate between these wearing-surfaces.

In order to preserve the chain-links and reduce the expense of replacingthem, I cast each of the links with a-segmental recess E in the interiorof the barrel B, this recess being offset from the pin-hole andextending from end to end of the barrel upon the side against which thepressure and wear are brought. lVithin this recess is fitted a segmentalsteel wear-plate F, the shape. of which is the same as that of thesegmental recess, so that it can be easily slipped in or out. The lengthof this plate is equal to the distance between the outer faces of thelink at this point, and when the link is introduced be? tween the morewidely separated ends of the next adjacent one, as shown in Fig. 2, thepin 0 is passed through the openings D and throughthe opening in thebarrel B, and the ends of the pin are then headed or otherwise firmlyfixed in the openings D, so that the movable joint is between theinterior of the barrel B and the surface of the pin 0 where it passesthrough the barrel. Any wear that takes place is brought upon the pinand the segment F, and this segment can be replaced at any time when toomuch worn for further use. In this manner I am enabled to save the linksfrom wear for an indefinite period, as there is no other portion whichis greatly affected by the wear.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. The improvement in drive-chain links, consisting of a link havingsidebars more widely separated at one end than the other and having asleeve or barrel cast with and extending between the narrower ends, apin or bolt, the ends of which are fixed in openwall against which thepressure and Wear are brought, a segmental channel or recess, offsetfrom the pin-hole and extending from end to I 5 end of the barrel, and aseparate segmental wear-plate fitting said ofisetand removable endWisetherefrom.

In Witness whereof I have hereunto set my hand.

BENJAMIN HOLT.

Vitnesses:

DAN. N. GILMORE, G. L. DIoKENsoN,

